ds164x.c
4.38 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
// SPDX-License-Identifier: GPL-2.0+
/*
* (C) Copyright 2002
* ARIO Data Networks, Inc. dchiu@ariodata.com
*
* modified for DS164x:
* The LEOX team <team@leox.org>, http://www.leox.org
*
* Based on MontaVista DS1743 code and U-Boot mc146818 code
*/
/*
* Date & Time support for the DS164x RTC
*/
/* #define RTC_DEBUG */
#include <common.h>
#include <command.h>
#include <rtc.h>
static uchar rtc_read(unsigned int addr );
static void rtc_write(unsigned int addr, uchar val);
#define RTC_EPOCH 2000 /* century */
/*
* DS164x registers layout
*/
#define RTC_BASE ( CONFIG_SYS_NVRAM_BASE_ADDR + CONFIG_SYS_NVRAM_SIZE )
#define RTC_YEAR ( RTC_BASE + 0x07 )
#define RTC_MONTH ( RTC_BASE + 0x06 )
#define RTC_DAY_OF_MONTH ( RTC_BASE + 0x05 )
#define RTC_DAY_OF_WEEK ( RTC_BASE + 0x04 )
#define RTC_HOURS ( RTC_BASE + 0x03 )
#define RTC_MINUTES ( RTC_BASE + 0x02 )
#define RTC_SECONDS ( RTC_BASE + 0x01 )
#define RTC_CONTROL ( RTC_BASE + 0x00 )
#define RTC_CONTROLA RTC_CONTROL /* W=bit6, R=bit5 */
#define RTC_CA_WRITE 0x80
#define RTC_CA_READ 0x40
#define RTC_CONTROLB RTC_SECONDS /* OSC=bit7 */
#define RTC_CB_OSC_DISABLE 0x80
#define RTC_CONTROLC RTC_DAY_OF_WEEK /* FT=bit6 */
#define RTC_CC_FREQ_TEST 0x40
/* ------------------------------------------------------------------------- */
int rtc_get( struct rtc_time *tmp )
{
uchar sec, min, hour;
uchar mday, wday, mon, year;
uchar reg_a;
reg_a = rtc_read( RTC_CONTROLA );
/* lock clock registers for read */
rtc_write( RTC_CONTROLA, ( reg_a | RTC_CA_READ ));
sec = rtc_read( RTC_SECONDS );
min = rtc_read( RTC_MINUTES );
hour = rtc_read( RTC_HOURS );
mday = rtc_read( RTC_DAY_OF_MONTH );
wday = rtc_read( RTC_DAY_OF_WEEK );
mon = rtc_read( RTC_MONTH );
year = rtc_read( RTC_YEAR );
/* unlock clock registers after read */
rtc_write( RTC_CONTROLA, ( reg_a & ~RTC_CA_READ ));
#ifdef RTC_DEBUG
printf( "Get RTC year: %02x mon: %02x mday: %02x wday: %02x "
"hr: %02x min: %02x sec: %02x\n",
year, mon, mday, wday,
hour, min, sec );
#endif
tmp->tm_sec = bcd2bin( sec & 0x7F );
tmp->tm_min = bcd2bin( min & 0x7F );
tmp->tm_hour = bcd2bin( hour & 0x3F );
tmp->tm_mday = bcd2bin( mday & 0x3F );
tmp->tm_mon = bcd2bin( mon & 0x1F );
tmp->tm_wday = bcd2bin( wday & 0x07 );
/* glue year in century (2000) */
tmp->tm_year = bcd2bin( year ) + RTC_EPOCH;
tmp->tm_yday = 0;
tmp->tm_isdst= 0;
#ifdef RTC_DEBUG
printf( "Get DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
tmp->tm_hour, tmp->tm_min, tmp->tm_sec );
#endif
return 0;
}
int rtc_set( struct rtc_time *tmp )
{
uchar reg_a;
#ifdef RTC_DEBUG
printf( "Set DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
#endif
/* lock clock registers for write */
reg_a = rtc_read( RTC_CONTROLA );
rtc_write( RTC_CONTROLA, ( reg_a | RTC_CA_WRITE ));
rtc_write( RTC_MONTH, bin2bcd( tmp->tm_mon ));
rtc_write( RTC_DAY_OF_WEEK, bin2bcd( tmp->tm_wday ));
rtc_write( RTC_DAY_OF_MONTH, bin2bcd( tmp->tm_mday ));
rtc_write( RTC_HOURS, bin2bcd( tmp->tm_hour ));
rtc_write( RTC_MINUTES, bin2bcd( tmp->tm_min ));
rtc_write( RTC_SECONDS, bin2bcd( tmp->tm_sec ));
/* break year in century */
rtc_write( RTC_YEAR, bin2bcd( tmp->tm_year % 100 ));
/* unlock clock registers after read */
rtc_write( RTC_CONTROLA, ( reg_a & ~RTC_CA_WRITE ));
return 0;
}
void rtc_reset (void)
{
uchar reg_a, reg_b;
reg_a = rtc_read( RTC_CONTROLA );
reg_b = rtc_read( RTC_CONTROLB );
if ( reg_b & RTC_CB_OSC_DISABLE )
{
printf( "real-time-clock was stopped. Now starting...\n" );
reg_a |= RTC_CA_WRITE;
reg_b &= ~RTC_CB_OSC_DISABLE;
rtc_write( RTC_CONTROLA, reg_a );
rtc_write( RTC_CONTROLB, reg_b );
}
/* make sure read/write clock register bits are cleared */
reg_a &= ~( RTC_CA_WRITE | RTC_CA_READ );
rtc_write( RTC_CONTROLA, reg_a );
}
/* ------------------------------------------------------------------------- */
static uchar rtc_read( unsigned int addr )
{
uchar val = *(volatile unsigned char*)(addr);
#ifdef RTC_DEBUG
printf( "rtc_read: %x:%x\n", addr, val );
#endif
return( val );
}
static void rtc_write( unsigned int addr, uchar val )
{
#ifdef RTC_DEBUG
printf( "rtc_write: %x:%x\n", addr, val );
#endif
*(volatile unsigned char*)(addr) = val;
}